I create a table using row groups according to the _5113_RowGroupingExample, the difference is some rows of my table do not belong to any groups. And these rows do not display. I use a RowGroupExpandCollapseLayer object as _5113_RowGroupingExample. So, what should I do to solve this problem?

BTW, in the two level group column example, there are columns do not belong to any columns, I want to realize that effect. But it seems that row group has a different mechanisam from the column group.